Elastic bushing pressing tooling for automotive electric power steering gear and elastic bushing pressing method

Abstract

The present invention discloses a press-fitting tooling for an elastic bushing of an automotive electric power steering gear, which includes a positioning device for positioning a steering gear housing assembly, a pressing device for applying a pressure in a first direction to the positioning device and pushing the elastic bushing into a receiving hole of the steering gear housing assembly, and a back-pressure device for applying a pressure in the first direction to the elastic bushing located in the receiving hole of the steering gear housing assembly, wherein the back-pressure device is arranged on the pressing device. The press-fitting tooling for the elastic bushing of the automotive electric power steering gear of the present invention has a simpler structure and can reduce the input cost. The present invention also discloses a method for press-fitting an elastic bushing of an automotive electric power steering gear.

Description

Technical Field

[0001] The present invention belongs to the technical field of production equipment for vehicle steering systems. Specifically, the present invention relates to a press-fitting tooling for an elastic bushing of an automotive electric power steering gear and a method for press-fitting the elastic bushing. Background Art

[0002] The elastic bushing is a part widely used in the existing automotive steering system without maintenance. It has functions such as anti-impact, anti-vibration and noise, anti-friction, anti-fatigue, and extending the service life of components. At the same time, it can transmit the required output force between components, and can also compensate for the assembly deviation during the assembly process, improving the driver's feel and comfort during steering.

[0003] The structure of the steering gear housing assembly and the elastic bushing is as Figure 2 shown. The steering gear housing assembly 61 includes a power-assisted side housing 5802, a steering side housing 5803, and a steering gear connecting steel pipe 5801 that presses the power-assisted side housing 5802 and the steering side housing 5803 together through interference fit between the inner hole and the shaft diameter. The power-assisted side housing 5802 and the steering side housing 5803 are made of aluminum parts for die casting, with good strength. The steering gear connecting steel pipe 5801 is made of steel parts with a hollow structure, having certain strength, anti-bending and anti-deformation characteristics.

[0004] The elastic bushing consists of an inner bushing for the installation hole and elastic rubber. The inner bushing is a hollow shaft-like component made of steel, with certain strength, and is fixedly connected to the frame mounting hole through bolts.

[0005] The elastic rubber is a cylindrical component with a small shaft diameter in the middle and large shaft diameters at both ends. It is made of NR rubber material and has certain characteristics such as hardness, radial static stiffness, and tensile strength. The small shaft diameter in the middle of the elastic rubber is in interference fit with the inner hole of the steering gear housing assembly 61, and the end rubber at both ends with large shaft diameters is in contact with the inner hole end face. There is elastic rubber in the up, down, left, and right directions of the installation hole of the steering gear housing assembly 61, playing roles such as anti-impact, anti-vibration and noise, anti-friction, and anti-fatigue. The elastic rubber is combined with the inner bushing through a vulcanization process.

[0006] The elastic bushing can be divided into the following two types according to the structural type:

[0007] The first type of elastic bushing includes a hollow kidney-shaped hole inner bushing 5901, end face elastic rubber 5902, outer circle elastic rubber 5903, and bevel groove 5904. It is used to be assembled in the first accommodation hole 5806 and the second accommodation hole 5807 of the power-assisted side housing 5802 on the power-assisted side housing. During the assembly process, the kidney-shaped hole inner bushing 5901 can compensate for the deviation of the frame mounting hole distance.

[0008] The second elastic bushing includes a hollow circular hole inner bushing 6001, an end face elastic rubber 6002, an outer circular elastic rubber 6003, and an angled groove 6004. It is used to be assembled in the first accommodation hole 5804 and the second accommodation hole 5805 of the steering side housing 5803. The hollow circular hole inner bushing 6001 plays a positioning role during assembly.

[0009] In addition to the angled grooves 5904 and 6004 of the above two elastic bushings playing a guiding role during press-fitting, they can also provide a shrinking buffer space during the press-fitting process when the end face elastic rubbers 5902 and 6002 are press-fitted and deformed, protecting the end face elastic rubbers from being squeezed, compressed permanently deformed, torn, and other failure phenomena during press-fitting deformation.

[0010] The above-mentioned structural design method of the elastic bushing requires two processes of press-fitting and back-pressuring in two directions to complete during press-fitting. The existing press-fitting method of the elastic bushing realizes the process method of press-fitting and back-pressuring in two directions by providing a servo electric cylinder (or hydraulic cylinder) at each end of the elastic bushing positioned on the tooling.

[0011] The problems of the above-mentioned press-fitting tooling for the elastic bushing of the automotive electric power steering gear (with a servo electric cylinder or hydraulic cylinder press-fitting method provided at each end) are as follows:

[0012] 1. When using a hydraulic cylinder for press-fitting, the control accuracy is poor, there are many system failures, the press-fitting position accuracy is poor, and the working efficiency is reduced.

[0013] 2. Two servo electric cylinders (or hydraulic cylinders) are required respectively for the two processes of press-fitting and back-pressuring to complete the assembly of the elastic bushing. The tooling structure is complex and the equipment cost is high.

[0014] 3. The equipment and the product tooling have strong specificity, poor versatility for its product structure, inconvenient product model change and debugging operations, and long time consumption. Summary of the Invention

[0015] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention provides a press-fitting tooling for the elastic bushing of an automotive electric power steering gear, aiming to reduce costs.

[0016] To achieve the above object, the technical solution adopted by the present invention is: A press-fitting tooling for the elastic bushing of an automotive electric power steering gear, including a positioning device for positioning the steering gear housing assembly, a press-fitting device for applying pressure in the first direction to the positioning device and pushing the elastic bushing into the accommodation hole of the steering gear housing assembly, and a back-pressuring device for applying pressure in the first direction to the elastic bushing located in the accommodation hole of the steering gear housing assembly. The back-pressuring device is arranged on the press-fitting device.

[0017] The positioning device includes a guiding bottom plate, a locking mechanism for applying pressure to the steering gear housing assembly, a guiding top sleeve aligned with the accommodating holes on the steering gear housing assembly, and a first inner hole positioning mechanism and a second inner hole positioning mechanism respectively used for positioning the steering gear housing assembly at both ends of the steering gear housing assembly. The locking mechanism, the guiding top sleeve, the first inner hole positioning mechanism, and the second inner hole positioning mechanism are arranged on the guiding bottom plate. Four accommodating holes are provided on the steering gear housing assembly, and a total of four guiding top sleeves are provided. The four guiding top sleeves are respectively a first guiding top sleeve, a second guiding top sleeve, a third guiding top sleeve, and a fourth guiding top sleeve.

[0018] The first inner hole positioning mechanism includes a power-assisted side positioning plate arranged on the guiding bottom plate and a power-assisted side positioning shaft arranged on the power-assisted side positioning plate and used for inserting into the first inner hole of the steering gear housing assembly. The second inner hole positioning mechanism includes a steering side positioning plate arranged on the guiding bottom plate and a steering side positioning shaft arranged on the steering side positioning plate and used for inserting into the second inner hole of the steering gear housing assembly. The power-assisted side positioning shaft and the steering side positioning shaft are parallel to the second direction, and the second direction is perpendicular to the first direction.

[0019] The locking mechanism includes a positioning block and a locking screw arranged on the guiding bottom plate, a pressing plate rotatably connected to the positioning block, and a locking handle for fixing the pressing plate on the locking screw. A cushion block for contacting the surface of the steering gear housing assembly is arranged on the pressing plate.

[0020] The press-fitting device includes a lower press-fitting execution mechanism that cooperates with the positioning device and is used for pressing the elastic bushing into the accommodating holes of the steering gear housing assembly, an upper press-fitting execution mechanism connected to the positioning device, and a press head assembly for applying pressure to the upper press-fitting execution mechanism along the first direction. The back-pressure device is connected to the press head assembly and the upper press-fitting execution mechanism.

[0021] The lower press-fitting execution mechanism includes a press-fitting bottom plate and guiding ejector rods arranged on the press-fitting bottom plate and inserted into the guiding top sleeves. A total of four guiding ejector rods are provided. The four guiding ejector rods are respectively a first guiding ejector rod, a second guiding ejector rod, a third guiding ejector rod, and a fourth guiding ejector rod. The first guiding ejector rod is inserted into the first guiding top sleeve, the second guiding ejector rod is inserted into the second guiding top sleeve, the third guiding ejector rod is inserted into the third guiding top sleeve, and the fourth guiding ejector rod is inserted into the fourth guiding top sleeve. A first power-assisted side positioning block is arranged on the third guiding ejector rod, and a second power-assisted side positioning block is arranged on the fourth guiding ejector rod.

[0022] The upper press-fitting actuator includes a guiding pressing plate and positioning rods disposed on the guiding pressing plate and connected to the guiding bottom plate. The guiding bottom plate is located below the guiding pressing plate. The pressing head assembly includes a pressing head body and a back-pressure positioning plate connected to the pressing head body. The back-pressure positioning plate is located above the guiding pressing plate.

[0023] The press-fitting device further includes a limiting plate configured to be switchable between a first position and a second position. In the preliminary press-fitting stage, the limiting plate is in the first position, where it is located on the top surface of the guiding pressing plate and below the back-pressure positioning plate. In the back-pressure stage, the limiting plate is in the second position, where it is clamped between the press-fitting bottom plate and the guiding bottom plate.

[0024] The back-pressure device includes back-pressure rods connected to the back-pressure positioning plate and aligned with the accommodating holes on the steering gear housing assembly, and back-pressure adjusting rods threadedly connected to the back-pressure rods and used for back-pressing the elastic bushing. There are four back-pressure rods in total, namely the first back-pressure rod, the second back-pressure rod, the third back-pressure rod, and the fourth back-pressure rod. There are four back-pressure adjusting rods in total, namely the first back-pressure adjusting rod, the second back-pressure adjusting rod, the third back-pressure adjusting rod, and the fourth back-pressure adjusting rod. The first back-pressure adjusting rod is screwed into the first back-pressure rod through threads, the second back-pressure adjusting rod is screwed into the second back-pressure rod through threads, the third back-pressure adjusting rod is screwed into the third back-pressure rod through threads, and the fourth back-pressure adjusting rod is screwed into the fourth back-pressure rod through threads.

[0025] The present invention also provides a method for press-fitting an elastic bushing of an automotive electric power steering gear, using the above-mentioned press-fitting tooling for the elastic bushing of the automotive electric power steering gear, and including the steps:

[0026] S1. Apply a lubricating medium to the accommodating holes of the steering gear housing assembly and the elastic bushing.

[0027] S2. Install the elastic bushing on the lower press-fitting actuator.

[0028] S3. Install the steering gear housing assembly on the positioning device.

[0029] S4. The pressing head assembly descends, and the pressing head assembly applies a pressure in the first direction to the upper press-fitting actuator. The lower press-fitting actuator pushes the elastic bushing into the accommodating hole of the steering gear housing assembly.

[0030] S5. The pressing head assembly returns to its original position.

[0031] S6. The pressing head assembly descends again, and the back-pressure device applies a pressure in the first direction to the elastic bushing located in the accommodating hole of the steering gear housing assembly, so that the elastic bushing is press-fitted in place.

[0032] The elastic bushing pressing tooling for the electric power steering gear of the present invention has a simpler structure and can reduce the input cost. Moreover, during the pressing process, the operation is simple, convenient, and reliable. By simply changing the position of the limit plate on the tooling, the two assembly processes of pressing and repressing four elastic bushings can be completed simultaneously, improving the pressing accuracy and work efficiency. For left-hand and right-hand products with similar structures, the tooling has good versatility and quick tool change. Only by correspondingly adjusting the positions of the first and second power-assisted side positioning blocks for positioning the elastic bushing at the power-assisted side housing according to the position changes of the power-assisted side housing and the steering side housing on the steering gear housing assembly can the tooling be changed, reducing the cost investment for repeated tooling production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] This specification includes the following drawings, the shown contents are respectively:

[0034] Figure 1 It is a schematic structural diagram of the elastic bushing pressing method for the electric power steering gear of the present invention;

[0035] Figure 2 It is a schematic structural diagram and enlarged view of the steering gear housing assembly and the elastic bushing;

[0036] Figure 3 It is a schematic structural diagram of the elastic bushing pressing tooling for the electric power steering gear of the present invention;

[0037] Figure 4 It is a schematic structural diagram of the elastic bushing pressing device;

[0038] Figure 5 It is a schematic structural diagram of the steering gear housing assembly positioning device;

[0039] Figure 6 It is a schematic structural diagram of the elastic bushing repressing device;

[0040] Figure 7 It is a schematic structural diagram of the power-assisted side positioning shaft and the steering side positioning shaft;

[0041] Figure 8.1 It is a schematic structural diagram of the first, second, third, and fourth guiding ejector rods;

[0042] Figure 8.2 It is a cross-sectional view of the first, second, third, and fourth guiding ejector rods;

[0043] Figure 8.3 It is a top view of the first, second, third, and fourth guiding ejector rods;

[0044] Figure 9.1 It is a schematic structural diagram of the first and second power-assisted side positioning blocks;

[0045] Figure 9.2It is the front view of the first and second assist side positioning blocks;

[0046] Figure 9.3 It is Figure 9.2 the sectional view taken along M-M in

[0047] Figure 10.1 the structural schematic diagram of the first, second, third, and fourth return pressure rods;

[0048] Figure 10.2 the sectional view of the first, second, third, and fourth return pressure rods;

[0049] Figure 11.1 the structural schematic diagram of the first, second, third, and fourth return pressure adjusting rods;

[0050] Figure 11.2 the front view of the first, second, third, and fourth return pressure adjusting rods;

[0051] Figure 11.3 the top view of the first, second, third, and fourth return pressure adjusting rods;

[0052] Figure 12.1 the structural schematic diagram of the locking mechanism;

[0053] Figure 12.2 It is Figure 12.1 the sectional view taken along N-N in

[0054] Figure 13 the front view of the elastic bushing pressing tooling for automotive electric power steering gear of the present invention;

[0055] Figure 14 It is Figure 13 the sectional view taken along A-A in

[0056] Figure 15 It is Figure 13 the sectional view taken along B-B in

[0057] Figure 16 It is Figure 13 the partial enlarged view of the sectional view taken along A-A and the first process of elastic bushing pressing;

[0058] Figure 17 It is Figure 13 the partial enlarged view of the sectional view taken along A-A and the second process of elastic bushing pressing;

[0059] Figure 18 It is Figure 13 the partial enlarged view of the sectional view taken along A-A and after the completion of the second process of elastic bushing pressing;

[0060] Figure 19 It is Figure 13 the partial enlarged view of the sectional view taken along A-A and the first process of elastic bushing backpressure;

[0061] Figure 20 is Figure 13 The A-A sectional view and the partial enlarged view of the second process of the elastic bushing back pressure

[0062] The markings in the figure are: 1. Press-fitting bottom plate; 2. Base positioning shaft; 3. T-shaped nut; 4. Gasket; 5. First hexagon socket head cap screw; 6. First guiding ejector rod; 601. First counterbore; 602. First rectangular groove; 603. First annular groove; 7. Second guiding ejector rod; 701. Second counterbore; 702. Second rectangular groove; 703. Second annular groove; 8. Third guiding ejector rod; 801. Third counterbore; 802. Third rectangular groove; 803. Third annular groove; 9. Fourth guiding ejector rod; 901. Fourth counterbore; 902. Fourth rectangular groove; 903. Fourth annular groove; 10. Shaft snap ring; 11. First boosting side positioning block; 1101. First small end outer diameter; 1102. First rectangular protruding part; 12. Second boosting side positioning block; 1201. Second small end outer diameter; 1202. Second rectangular protruding part; 13. Second hexagon socket head cap screw; 14. Guiding bottom plate; 15. Fourth guiding ejector sleeve; 16. First locking screw; 17. First locking handle; 18. Second locking screw; 19. Second locking handle; 20. First guiding ejector sleeve; 21. Third hexagon socket head cap screw; 22. Steering side positioning plate; 23. Steering side positioning shaft; 2301. First groove section; 2302. Second groove section; 24. Hexagon nut; 25. Fourth hexagon socket head cap screw; 26. Second guiding ejector sleeve; 2701. First positioning block; 2801. First spacer; 2901. First pressing plate; 2702. Second positioning block; 2802. Second spacer; 2902. Second pressing plate; 30. Third guiding ejector sleeve; 31. Boosting side positioning plate; 32. Boosting side positioning shaft; 3201. First sliding groove; 33. Fourth positioning rod; 34. Fourth adjusting nut; 35. Fourth backpressure adjusting rod; 36. Third positioning rod; 37. First adjusting nut; 38. First positioning rod; 39. First backpressure adjusting rod; 40. Second positioning rod; 41. Guiding pressing plate; 42. First limiting plate; 43. Second backpressure rod; 4301. Sixth annular groove; 44. First backpressure rod; 4401. Fifth annular groove; 45. Backpressure positioning plate; 46. Press head body; 47. Third backpressure rod; 4701. Seventh annular groove; 48. Fourth backpressure rod; 4801. Eighth annular groove; 49. Second limiting plate; 50. Third adjusting nut; 51. Third backpressure adjusting rod; 52. Second adjusting nut; 53. Second backpressure adjusting rod; 54. Oil-free bushing; 55. Force sensor connector; 56. Servo press; 57. T-slot positioning bottom plate; 5801. Steering gear connecting steel pipe; 5802. Boosting side housing; 5803. Steering side housing; 5804. First accommodation hole; 5805. Second accommodation hole; 5806. Fourth accommodation hole; 5807. Third accommodation hole; 5901. Waist-shaped hole lining sleeve; 5902. End face elastic rubber; 5903. Outer circle elastic rubber; 5904. Oblique angle groove; 6001. Circular hole lining sleeve; 6002. End face elastic rubber; 6003. Outer circle elastic rubber;6004, bevel groove; 61, steering gear housing assembly; 62, press-fitting tooling. Detailed implementation manner

[0063] The following is a further detailed description of the specific implementation manner of the present invention by describing the embodiments with reference to the accompanying drawings, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitate its implementation.

[0064] It should be noted that in the following embodiments, the "first", "second", "third" and "fourth" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order of precedence, but are only for the convenience of description.

[0065] As Figures 1 to 20 shown, the present invention provides a press-fitting tooling for an elastic bushing of an automotive electric power steering gear, including a positioning device for positioning the steering gear housing assembly, a press-fitting device for applying a pressure in a first direction to the positioning device and pushing the elastic bushing into the accommodation hole of the steering gear housing assembly, and a back-pressure device for applying a pressure in the first direction to the elastic bushing located in the accommodation hole of the steering gear housing assembly. The back-pressure device is arranged on the press-fitting device.

[0066] Specifically, as Figure 2 shown, the steering gear housing assembly 61 includes a power-assisted side housing 5802, a steering side housing 5803, and a steering gear connecting steel pipe 5801 that presses the power-assisted side housing 5802 and the steering side housing 5803 together by an interference fit between the inner hole and the shaft diameter. The power-assisted side housing 5802 and the steering side housing 5803 are made of aluminum parts for die-casting, having good strength. The steering gear connecting steel pipe 5801 is made of steel parts of a hollow component, having certain strength, bending resistance and deformation resistance characteristics.

[0067] There are two types of elastic bushings, namely the first type of elastic bushing and the second type of elastic bushing. The first type of elastic bushing includes an elastic outer ring and a kidney-shaped hole inner bushing 5901 located in the central hole of the elastic outer ring. The elastic outer ring is combined with the kidney-shaped hole inner bushing 5901 through a vulcanization process. The elastic outer ring includes an end face elastic rubber 5902, an outer circular elastic rubber 5903, and an inclined groove 5904. The kidney-shaped hole inner bushing 5901 is a hollow shaft component. The material of the kidney-shaped hole inner bushing 5901 is steel, which has a certain strength and is fixedly connected to the frame mounting hole through bolts. The elastic outer ring is a cylindrical component with a small shaft diameter in the middle and large shaft diameters at both ends. The material of the elastic outer ring is NR rubber, which has certain hardness, radial static stiffness, and tensile strength and other characteristics. The outer circular elastic rubber 5903 is the part with a small shaft diameter in the middle of the elastic outer ring. The outer circular elastic rubber 5903 is used for interference fit with the accommodation hole of the steering gear housing assembly 61. Two end face elastic rubbers 5902 are provided. The two end face elastic rubbers 5902 are the parts with large shaft diameters at both ends of the elastic outer ring. The outer circular elastic rubber 5903 is located between the two end face elastic rubbers 5902. The inclined groove 5904 is the transition part between the end face elastic rubber 5902 and the outer circular elastic rubber 5903. The outer surface at the inclined groove 5904 is a conical surface. The end faces of the two end face elastic rubbers 5902 are respectively attached to the two end faces of the accommodation hole of the steering gear housing assembly 61. There is elastic rubber at the upper, lower, left, and right directions of the mounting hole of the steering gear housing assembly 61, which plays roles such as anti-impact force, anti-vibration noise, anti-friction, and anti-fatigue. The second type of elastic bushing includes an elastic outer ring and a circular hole inner bushing 6001 located in the central hole of the elastic outer ring. The elastic outer ring is combined with the circular hole inner bushing 6001 through a vulcanization process. The elastic outer ring includes an end face elastic rubber 6002, an outer circular elastic rubber 6003, and an inclined groove 6004. The circular hole inner bushing 6001 is a hollow shaft component. The material of the circular hole inner bushing 6001 is steel, which has a certain strength and is fixedly connected to the frame mounting hole through bolts. The hollow circular hole inner bushing 6001 plays a positioning role during assembly. The elastic outer ring is a cylindrical component with a small shaft diameter in the middle and large shaft diameters at both ends. The material of the elastic outer ring is NR rubber, which has certain hardness, radial static stiffness, and tensile strength and other characteristics. The outer circular elastic rubber 6003 is the part with a small shaft diameter in the middle of the elastic outer ring. The outer circular elastic rubber 6003 is used for interference fit with the accommodation hole of the steering gear housing assembly 61. Two end face elastic rubbers 6002 are provided. The two end face elastic rubbers 6002 are the parts with large shaft diameters at both ends of the elastic outer ring. The outer circular elastic rubber 6003 is located between the two end face elastic rubbers 6002. The inclined groove 6004 is the transition part between the end face elastic rubber 6002 and the outer circular elastic rubber 6003. The outer surface at the inclined groove 6004 is a conical surface. The end faces of the two end face elastic rubbers 6002 are respectively attached to the two end faces of the accommodation hole of the steering gear housing assembly.

[0068] In addition to the chamfered grooves 5904 and 6004 of the above two elastic bushings playing a guiding role during press-fitting, they can also provide a shrinking buffer space for the end-face elastic rubber materials 5902 and 6002 during press-fitting deformation, protecting the end-face elastic rubber materials from being squeezed and damaged during press-fitting deformation, such as compression permanent deformation and tearing failure phenomena.

[0069] As Figure 5 , Figure 7 , Figure 12.1 , Figure 12.2 , Figure 14 and Figure 15 shown, the positioning device includes a guiding bottom plate 14, a locking mechanism for applying pressure to the steering gear housing assembly 61, a guiding top sleeve that is aligned with the accommodating hole position on the steering gear housing assembly 61 and is used to accommodate the elastic bushing, and a first inner hole positioning mechanism and a second inner hole positioning mechanism respectively used to position the steering gear housing assembly 61 at both ends of the steering gear housing assembly 61. The locking mechanism, the guiding top sleeve, the first inner hole positioning mechanism, and the second inner hole positioning mechanism are arranged on the guiding bottom plate 14. Four accommodating holes are provided on the steering gear housing assembly 61, and a total of four guiding top sleeves are provided. The four guiding top sleeves are respectively the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15. The guiding bottom plate 14 is horizontally arranged, and the locking mechanism, the four guiding top sleeves, the first inner hole positioning mechanism, and the second inner hole positioning mechanism are arranged on the top surface of the guiding bottom plate 14. The locking mechanism and the four guiding top sleeves are located between the first inner hole positioning mechanism and the second inner hole positioning mechanism. The guiding bottom plate 14 is rectangular in shape and is made of aluminum plate material, aiming to reduce the weight of the tooling and facilitate the handling of the tooling. Four through holes with the same size are respectively provided at the positions of the first guiding ejector rod 6, the second guiding ejector rod 7, the third guiding ejector rod 8, and the fourth guiding ejector rod 9 fixedly connected to the press-fitting bottom plate 1 on the guiding bottom plate 14. The four through holes are in interference fit with the lower ends of the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15. The first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 are vertically arranged on the guiding bottom plate 14. A countersunk hole for assembling the third internal hexagonal bolt is provided at each of the four corners of the lower end surface of the guiding bottom plate 14.

[0070] As Figure 5 , Figure 7 , Figure 14 and Figure 15As shown in the figure, the first inner hole positioning mechanism includes a power-assisted side positioning plate 31 disposed on the guiding bottom plate 14 and a power-assisted side positioning shaft 32 disposed on the power-assisted side positioning plate 31 and inserted into the first inner hole of the steering gear housing assembly 61. The second inner hole positioning mechanism includes a steering side positioning plate 22 disposed on the guiding bottom plate 14 and a steering side positioning shaft 23 disposed on the steering side positioning plate 22 and inserted into the second inner hole of the steering gear housing assembly 61. The power-assisted side positioning shaft 32 and the steering side positioning shaft 23 are parallel to the second direction, the second direction is perpendicular to the first direction, the second direction is the horizontal direction, and the first direction is the vertical direction. The power-assisted side positioning plate 31 and the steering side positioning plate 22 are vertically disposed at both ends in the length direction of the guiding bottom plate 14. The power-assisted side positioning plate 31 is connected to the guiding bottom plate 14 by two third hexagon socket head cap screws 21, and two internal threaded holes for screwing and fixing the power-assisted side positioning plate 31 with the two third hexagon socket head cap screws 21 are provided on the top surface of the guiding bottom plate 14. The steering side positioning plate 22 is connected to the guiding bottom plate 14 by another two third hexagon socket head cap screws 21, and two internal threaded holes for screwing and fixing the steering side positioning plate 22 with the two third hexagon socket head cap screws 21 are provided on the right end surface of the guiding bottom plate 14.

[0071] As Figure 5 , Figure 7 , Figure 14 and Figure 15 shown, the power-assisted side positioning plate 31 is convex in shape and made of steel. Two through holes for screwing and positioning with the third hexagon socket head cap screws 21 and the internal threaded holes on the guiding bottom plate 14 are provided at the lower end of the power-assisted side positioning plate 31. A first guiding hole for the power-assisted side positioning shaft 32 to pass through is provided on the power-assisted side positioning plate 31, and the end face of the first guiding hole on the power-assisted side positioning plate 31 is abutted and limited with the end face of the hole of the power-assisted side housing 5802. The power-assisted side positioning shaft 32 is a hollow stepped shaft component, made of steel, and has certain wear resistance. As Figure 7As shown, the assist-side positioning shaft 32 includes a large-diameter section and a small-diameter section that are connected. The large-diameter section and the small-diameter section are coaxial cylinders, and the diameter of the large-diameter section is greater than that of the small-diameter section. The large-diameter section of the assist-side positioning shaft 32 is for the operator to hold. The outer circumferential surface of the large-diameter section of the assist-side positioning shaft 32 is provided with a full-circle knurled surface to increase the surface friction and facilitate manual operation. The first guiding hole is a circular hole, and the diameter of the first guiding hole is the same as the outer diameter of the small-diameter section of the assist-side positioning shaft 32. The two are in a small clearance fit to ensure accurate positioning. When positioning the steering gear housing assembly 61, after the assist-side positioning shaft 32 is inserted into the first inner hole of the steering gear housing assembly 61, the assist-side positioning shaft 32 is locked and fixed to the assist-side positioning plate 31 by the fourth hexagon socket head cap screw 25 and the hexagon nut 24. The fourth hexagon socket head cap screw 25 is threadedly connected to the assist-side positioning plate 31. An end portion of the fourth hexagon socket head cap screw 25 is embedded in a first chute 3201 provided on the outer circumferential surface of the small-diameter section of the assist-side positioning shaft 32. The first chute 3201 is a waist-shaped groove. The length direction of the first chute 3201 is parallel to the second direction. The width direction of the first chute 3201 is greater than the diameter of the embedded end of the fourth hexagon socket head cap screw 25. There is a 0.5-mm gap between the bottom surface of the first chute 3201 and the end face of the fourth hexagon socket head cap screw 25, which facilitates the movement of the assist-side positioning shaft 32 in the axial direction (i.e., the second direction along the length of the fourth hexagon socket head cap screw 25 in the first chute 3201), so that the assist-side positioning shaft 32 can only move axially in the first guiding hole on the assist-side positioning plate 31. After the assist-side positioning shaft 32 is inserted into the first inner hole of the steering gear housing assembly 61 to the right, the assist-side positioning shaft 32 is limited on the assist-side positioning plate 31 to ensure that the assist-side positioning shaft 32 can accurately position the steering gear housing assembly 61. After the assist-side positioning shaft 32 is pulled out to the left, the assist-side positioning shaft 32 can move axially to the left, and the assist-side positioning shaft 32 can be pulled out from the first inner hole of the steering gear housing assembly 61.

[0072] As Figure 5 , Figure 7 , Figure 14 and Figure 15 shown, the steering-side positioning plate 22 is rectangular in shape and made of steel. Two through holes for screwing and positioning with the third hexagon socket head cap screw 21 and the internal threaded holes on the guiding bottom plate 14 are provided at the lower end of the steering-side positioning plate 22. A second guiding hole for the steering-side positioning shaft 23 to pass through is provided on the steering-side positioning plate 22. The first guiding hole and the second guiding hole are coaxially arranged. The steering-side positioning shaft 23 is a hollow stepped shaft component made of steel and has certain wear resistance. As Figure 7As shown, the steering side positioning shaft 23 includes a large-diameter section and a small-diameter section that are connected. The large-diameter section and the small-diameter section are coaxial cylinders, and the diameter of the large-diameter section is greater than that of the small-diameter section. The large-diameter section of the steering side positioning shaft 23 is for the operator to hold. The outer circumferential surface of the large-diameter section of the steering side positioning shaft 23 is provided with a full-circle knurled surface to increase the surface friction and facilitate manual operation. The second guiding hole is a round hole and the diameter of the second guiding hole is the same as the outer diameter of the small-diameter section of the steering side positioning shaft 23, and the two adopt a small clearance fit to ensure accurate positioning. When positioning the steering gear housing assembly 61, after the steering side positioning shaft 23 is inserted into the second inner hole of the steering gear housing assembly 61, the steering side positioning shaft 23 is locked and fixed on the steering side positioning plate 22 by the fourth hexagon socket head cap screw 25 and the hexagon nut 24. The fourth hexagon socket head cap screw 25 is threadedly connected to the steering side positioning plate 22. The end of the fourth hexagon socket head cap screw 25 is embedded in a second chute provided on the outer circumferential surface of the small-diameter section of the steering side positioning shaft 23, and this second chute is an L-shaped groove. There is a 0.5 mm gap between the bottom surface of the second chute and the end surface of the fourth hexagon socket head cap screw 25, which facilitates the movement of the steering side positioning shaft 23 in the axial direction (i.e., the second direction along the length in the first groove section 2301 of the second chute of the fourth hexagon socket head cap screw 25). After the steering side positioning shaft 23 is inserted into the second inner hole of the steering gear housing assembly 61 and the end surface of the small shaft diameter of the steering side positioning shaft 23 is respectively in contact with the bottom surface of the central hole of the steering side housing 5803 and the end surface of the orifice of the first guiding hole on the boosting side positioning plate 31 is in contact with the end surface of the orifice of the boosting side housing 5802, rotate the steering side positioning shaft 23 counterclockwise, so that the fourth hexagon socket head cap screw 25 on the steering side positioning plate 22 slides into the second groove section 2302 of the steering side positioning shaft 23, and the steering side positioning shaft 23 is fixed on the steering side positioning plate to ensure that the steering side positioning shaft 23 can accurately position the steering gear housing assembly 61. Rotate the steering side positioning shaft 23 clockwise, so that the fourth hexagon socket head cap screw 25 on the steering side positioning plate 22 slides into the first groove section 2301 of the steering side positioning shaft 23, and pulling the steering side positioning shaft 23 to the right can move it axially, and the steering side positioning shaft 23 can be withdrawn from the second inner hole of the steering gear housing assembly 61.

[0073] As Figure 5 and Figure 7As shown, the second sliding groove includes a first groove section 2301 and a second groove section 2302 that are connected and communicate with each other. Both the first groove section 2301 and the second groove section 2302 are waist-shaped grooves, and the first groove section 2301 and the second groove section 2302 are perpendicular to each other. The length direction of the first groove section 2301 is parallel to the second direction. The length directions of the first groove section 2301 and the second groove section 2302 are greater than the diameter of the embedded end of the fourth hexagon socket head cap screw 25, and the widths of the first groove section 2301 and the second groove section 2302 are greater than the diameter of the fourth hexagon socket head cap screw 25 by 0.5 mm, facilitating the movement position of the steering side positioning shaft 23 relative to the fourth hexagon socket head cap screw 25 within the second sliding groove. The second groove section 2302 communicates with one end of the first groove section 2301 that is close to the large-diameter section of the steering side positioning shaft 23, that is, the position of the second groove section 2302 is close to the large-diameter section of the steering side positioning shaft 23. When positioning the steering gear housing assembly 61, during the process of inserting the steering side positioning shaft 23 into the second inner hole of the steering gear housing assembly 61, the fourth hexagon socket head cap screw 25 on the steering side positioning plate 22 moves relative to the steering side positioning shaft 23 along the first groove section 2301 of the steering side positioning shaft 23. When the fourth hexagon socket head cap screw 25 moves to the second groove section 2302, rotate the steering side positioning shaft 23 to make the fourth hexagon socket head cap screw 25 slide into the second groove section 2302. The fourth hexagon socket head cap screw 25 can play a limiting role in the axial direction of the steering side positioning shaft 23 to prevent the steering side positioning shaft 23 from undergoing axial displacement, so that the small-diameter end face of the steering side positioning shaft 23 fits against the bottom surface of the central hole of the steering side housing 5803. At this time, the positioning of the steering gear housing assembly 61 is completed through the end face limit of the power assist side positioning plate 31, the center positioning of the power assist side positioning shaft 32 and the steering side positioning shaft 23, the axial limit of the second groove section 2302 of the steering side positioning shaft 23 and the upper end faces of the orifice of the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15, quickly completing the precise positioning of the position of the steering gear housing assembly 61 before press-fitting.

[0074] As Figure 5 , Figure 12.1 , Figure 12.2 , Figure 14 and Figure 15As shown, in this embodiment, two locking mechanisms are provided. The two locking mechanisms are on the same straight line parallel to the second direction. The structural dimensions and assembly methods of the components on each locking mechanism are the same. One locking mechanism includes a first positioning block 2701 and a first locking screw 16 provided on the guiding bottom plate 14, a first pressing plate 2901 rotatably connected to the first positioning block 2701, and a first locking handle 17 for fixing the first pressing plate 2901 on the first locking screw 16. A first cushion block 2801 for contacting the surface of the steering gear housing assembly 61 is provided on the first pressing plate 2901. The first cushion block 2801 is made of nylon soft material to prevent the steel first pressing plate 2901 from directly contacting the steering gear housing assembly 61 and causing damage to the steering gear housing assembly 61. The other locking mechanism includes a second positioning block 2702 and a second locking screw 18 provided on the guiding bottom plate 14, a first pressing plate 2902 rotatably connected to the second positioning block 2702, and a second locking handle 19 for fixing the second pressing plate 2902 on the second locking screw 18. A second cushion block 2802 for contacting the surface of the steering gear housing assembly 61 is provided on the second pressing plate 2902. The second cushion block 2802 is made of nylon soft material to prevent the steel second pressing plate 2902 from directly contacting the steering gear housing assembly 61 and causing damage to the steering gear housing assembly 61. Both the first positioning block 2701 and the second positioning block 2702 are groove rectangles with the same structural dimensions and are made of steel parts, having a certain strength. The first positioning block 2701 and the second positioning block 2702 are respectively fixedly installed on the top surface of the guiding bottom plate 14 through first hexagon socket head cap screws 5. Both the first pressing plate 2901 and the second pressing plate 2902 are arc-shaped convex parts with the same structural dimensions and are made of steel parts. One end of the first pressing plate 2901 and the second pressing plate 2902 are respectively rotatably connected to the first positioning block 2701 and the second positioning block 2702. The rotation center lines of the first pressing plate 2901 and the second pressing plate 2902 are parallel to the second direction. U-shaped grooves for the first locking screw 16 and the second locking screw 18 to pass through are provided at the other ends of the first pressing plate 2901 and the second pressing plate 2902. The first locking screw 16 and the second locking screw 18 are respectively fixedly provided on the top surface of the guiding bottom plate 14. The first locking screw 16 and the second locking screw 18 of the locking mechanism and the first positioning block 2701 and the second positioning block 2702 are on the same straight line parallel to the third direction. The third direction is the horizontal direction and the third direction is perpendicular to the second direction. The first locking handle 17 is threadedly connected to the first locking screw 16. The first locking handle 17 is used to tightly fix the first pressing plate 2901 on the first locking screw 16 in the locked state, so that the first pressing plate 2901 can apply pressure to the steering gear housing assembly 61 to keep the steering gear housing assembly 61 fixed.The second locking handle 19 is threadedly connected to the second locking screw 18. The first locking handle 19 is used to press and fix the first pressing plate 2902 onto the first locking screw 18 in the locked state, so that the first pressing plate 2902 can apply pressure to the steering gear housing assembly 61 to keep the steering gear housing assembly 61 fixed. When it is necessary to loosen the steering gear housing assembly 61, first loosen and remove the first locking handle 17 and the second locking handle 19, and then rotate the first pressing plate 2901 and the second pressing plate 2902 upward. The first pressing plate 2901 and the second pressing plate 2902 no longer press the steering gear housing assembly 61, so that the steering gear housing assembly 61 can be taken out.

[0075] As Figure 5 , Figure 12.1 and Figure 12.2 shown, the first cushion block 2801 and the second cushion block 2802 are both arc-shaped with the same structural dimensions, and are matched with the shape of the contact part on the steering gear housing assembly 61. The first cushion block 2801 and the second cushion block 2802 are preferably made of nylon material, with certain compressive strength and wear resistance, to protect the surface of the shaft diameter of the pressed steering gear connecting steel pipe 5801 from being bruised. The first cushion block 2801 is adhesively fixed to the first pressing plate 2901 at the middle position between the two ends of the first pressing plate 2901. The second cushion block 2802 is adhesively fixed to the second pressing plate 2902 at the middle position between the two ends of the second pressing plate 2902. The internal arc dimension of the first cushion block 2801 and the second cushion block 2802 is 0.3 mm larger than the shaft diameter of the steering gear connecting steel pipe 5801, so that the pressed surface fits better.

[0076] As Figure 5 , Figure 12.1 and Figure 12.2As shown, in this embodiment, two locking mechanisms are provided. The two locking mechanisms are on the same straight line parallel to the second direction. The locking screw of one locking mechanism is the first locking screw 16, and the locking screw of the other locking mechanism is the second locking screw 18. The first locking screw 16 and the second locking screw 18 are both the same stepped shaft components with the same size, and the first locking screw 16 and the second locking screw 18 are made of steel. External threads that are screwed into the internal threaded holes on the guiding bottom plate 14 are provided at the lower ends of the first locking screw 16 and the second locking screw 18. The locking handle that cooperates with the first locking screw 16 is the first locking handle 17, and an external threaded hole for screwing with the first locking handle 17 is provided at the upper end of the first locking screw 16. A pair of opposite side notches for tightening with an open-end wrench are provided at the upper end of the middle shaft diameter of the first locking screw 16. The locking handle that cooperates with the second locking screw 18 is the second locking handle 19, and an external threaded hole for screwing with the second locking handle 19 is provided at the upper end of the second locking screw 18. A pair of opposite side notches for tightening with an open-end wrench are provided at the upper end of the middle shaft diameter of the second locking screw 18. The first locking handle 17 and the second locking handle 19 are both the same cylindrical components with the same size and are made of steel. Internal threaded holes for screwing with the external threads at the upper ends of the first locking screw 16 and the second locking screw 18 are respectively provided in the middle parts of the first locking handle 17 and the second locking handle 19. A whole-circle knurled surface is provided on the outer circumferential surface of the first locking handle 17 and the second locking handle 19 to increase the surface friction and facilitate manual operation. A set of counterbore holes and corresponding internal threaded holes are provided at each of the positions on the guiding bottom plate 14 that are convenient for fixing the two ends of the steering gear connecting steel pipe 5801. The counterbore holes are positioned and tightened through assembling the third hexagon socket head cap screw 21 with the second internal threaded holes on the first positioning block 2701 and the second positioning block 2702, and the internal threaded holes are respectively positioned and tightened with the external threads at the upper and lower ends of the first locking screw 16 and the second locking screw 18.

[0077] As Figure 5 , Figure 14 and Figure 15As shown, the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 are all the same hollow stepped shaft components with the same size. The first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 are made of steel. At the upper large-end shaft diameter center axis direction of the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15, there are counterbores with an outer diameter of 0.2 mm clearance fit for accommodating the end face elastic rubber materials 5902 and 6002 of the elastic bushings. The depth of the counterbores is greater than the length dimensions of the first type of elastic bushing and the second type of elastic bushing, making the assembly of the first type of elastic bushing and the second type of elastic bushing convenient and the positioning accurate. The lower small-end shaft diameter has an interference fit with the corresponding through holes on the guiding bottom plate 14. Two oil-free bushings 54 are press-fitted into the inner holes of the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 respectively. The inner holes of the oil-free bushings 54 press-fitted into the inner holes of the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 have clearance fits with the respective shaft diameters on the first guiding ejector rod 6, the second guiding ejector rod 7, the third guiding ejector rod 8, and the fourth guiding ejector rod 9. The first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 are cylinders with openings at both ends and hollow inside. The first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 are vertically arranged on the guiding bottom plate 14. The first guiding top sleeve 20 and the fourth guiding top sleeve 15 are on the same straight line parallel to the second direction. The second guiding top sleeve 26 and the third guiding top sleeve 30 are on another straight line parallel to the second direction. The first guiding top sleeve 20 and the second guiding top sleeve 26 are on the same straight line parallel to the third direction. The third guiding top sleeve 30 and the fourth guiding top sleeve 15 are on another straight line parallel to the third direction. Two locking mechanisms are located between the first guiding top sleeve 20 and the fourth guiding top sleeve 15 and between the second guiding top sleeve 26 and the third guiding top sleeve 30.

[0078] As Figure 4 , Figure 14 and Figure 15As shown in the figure, the press-fitting device includes a lower press-fitting actuator that cooperates with the positioning device and is used to press the elastic bushing into the accommodating hole of the steering gear housing assembly 61, an upper press-fitting actuator connected to the positioning device, and a press head assembly that applies pressure to the upper press-fitting actuator in the first direction. The back-pressure device is connected to the press head assembly and the upper press-fitting actuator. The lower press-fitting actuator includes a press-fitting bottom plate 1 and a guiding ejector rod disposed on the press-fitting bottom plate 1 and inserted into the guiding top sleeve. A total of four guiding ejector rods are provided, namely the first guiding ejector rod 6, the second guiding ejector rod 7, the third guiding ejector rod 8, and the fourth guiding ejector rod 9. The first guiding ejector rod 6 is inserted into the first guiding top sleeve 20, the second guiding ejector rod 7 is inserted into the second guiding top sleeve 26, the third guiding ejector rod 8 is inserted into the third guiding top sleeve 30, and the fourth guiding ejector rod 9 is inserted into the fourth guiding top sleeve 15. A first assisting side positioning block 11 is provided on the third guiding ejector rod 8, and a second assisting side positioning block 12 is provided on the fourth guiding ejector rod 9. The press-fitting bottom plate 1 is horizontally arranged, located below the guiding bottom plate 14 and parallel to the guiding bottom plate 14. The first guiding ejector rod 6, the second guiding ejector rod 7, the third guiding ejector rod 8, and the fourth guiding ejector rod 9 are vertically arranged on the press-fitting bottom plate 1. The first guiding ejector rod 6 and the first guiding top sleeve 20 are coaxially arranged, the second guiding ejector rod 7 and the second guiding top sleeve 26 are coaxially arranged, the third guiding ejector rod 8 and the third guiding top sleeve 30 are coaxially arranged, and the fourth guiding ejector rod 9 and the fourth guiding top sleeve 15 are coaxially arranged.

[0079] The press-fitting bottom plate 1 is rectangular in shape and made of aluminum plate. Its purpose is to reduce the weight of the tooling and facilitate the handling of the tooling. A through hole is provided at the center of the press-fitting bottom plate 1, which is in interference fit with the outer diameter of the small end of the base positioning shaft 2, so that the press-fitting bottom plate 1 is fastened to the base positioning shaft 2. The lower large shaft diameter of the base positioning shaft 2 and the central through hole of the T-slot positioning bottom plate 57 are in a smaller clearance fit, so that the tooling is accurately positioned, ensuring that the center during tooling positioning is on the same axis as the central through hole of the T-slot positioning bottom plate 57 and the force sensor connector 55 on the servo press 56, realizing the function of quick tool change and positioning the center of the tooling. U-shaped grooves of the same size are provided at both ends of the left and right sides of the press-fitting bottom plate 1, facilitating fastening to the T-slot positioning bottom plate 57 through the T-nut 3, washer 4, and first hexagon socket head cap screw 5. At the joint end face of the press-fitting bottom plate 1 and the T-slot positioning bottom plate 57, 4 counterbore holes for assembling the third hexagon socket head cap screw 21 are provided with the same size as the four mounting holes on the steering gear housing assembly 61. Counterbored holes with a smaller clearance fit with the outer diameter of the first guiding ejector rod 6, the second guiding ejector rod 7, the third guiding ejector rod 8, and the fourth guiding ejector rod 9 are provided at the other end of the holes, so as to ensure that the four guiding ejector rods correspond to the four mounting holes on the steering gear housing assembly 61 respectively on each axis, and are positioned in the corresponding counterbored holes on the press-fitting bottom plate 1 by screwing the third hexagon socket head cap screw 21 into the internal threaded holes on the four guiding ejector rods.

[0080] The base positioning shaft 2 is a hollow stepped shaft component made of steel, with certain wear resistance. The lower large shaft diameter of the base positioning shaft 2 has a small clearance fit with the central through hole of the T-shaped groove positioning bottom plate 57, enabling precise positioning of the tooling and facilitating the replacement of the tooling. The upper small shaft diameter of the base positioning shaft 2 has an interference fit with the central through hole of the press-fitting bottom plate 1, fastening the press-fitting bottom plate 1 and the base positioning shaft 2 together. Through the small clearance fit between the lower large shaft diameter of the base positioning shaft 2 and the central through hole of the T-shaped groove positioning bottom plate 57, the tooling is precisely positioned, and the center during tooling positioning is on the same axis as the central through hole of the T-shaped groove positioning bottom plate 57 and the force sensor connector 55 on the servo press 56, realizing the function of rapid model change and positioning the center of the tooling.

[0081] The external dimensions of the T-shaped nut 3 have a clearance fit with the T-shaped groove on the T-shaped groove positioning bottom plate 57, and an internal threaded hole is provided in the middle, which is screwed with the first hexagon socket head cap screw 5 and locks the press-fitting bottom plate 1 through the gasket 4.

[0082] The first guide ejector rod 6, the second guide ejector rod 7, the third guide ejector rod 8, and the fourth guide ejector rod 9 are all cylindrical components of the same size. The first guide ejector rod 6, the second guide ejector rod 7, the third guide ejector rod 8, and the fourth guide ejector rod 9 are made of steel and can withstand large tensile and compressive forces. The first guide ejector rod 6, the second guide ejector rod 7, the third guide ejector rod 8, and the fourth guide ejector rod 9 are installed on the press-fitting bottom plate 1 through the third hexagon socket head cap screw 21. A first internal threaded hole for screwing with the third hexagon socket head cap screw 21 is provided in the middle of the lower end face of the first guide ejector rod 6, the second guide ejector rod 7, the third guide ejector rod 8, and the fourth guide ejector rod 9. The shaft diameters of the first guide ejector rod 6, the second guide ejector rod 7, the third guide ejector rod 8, and the fourth guide ejector rod 9 have a clearance fit with the counterbore at the upper end face of the press-fitting bottom plate 1 and the inner hole of the oil-free bushing 54. The bottom end face of the counterbore is used for limiting, and they are locked in the counterbore at the upper end face of the press-fitting bottom plate 1 through the third hexagon socket head cap screw 21.

[0083] Such as Figure 4 、 Figures 8.1 to 8.3 、 Figure 9.1 、 Figure 14 and Figure 15As shown in the figure, a first booster side positioning block 11 is arranged on the third guide ejector rod 8, and a second booster side positioning block 12 is arranged on the fourth guide ejector rod 9. The first booster side positioning block 11 is fixedly installed at the upper end of the third guide ejector rod 8 through a second hexagon socket head cap screw 13, and a second internal thread hole coaxial with the first internal thread hole at the lower end is arranged on the upper end face of the third guide ejector rod 8. The second booster side positioning block 12 is fixedly installed at the upper end of the fourth guide ejector rod 9 through a second hexagon socket head cap screw 13, and a second internal thread hole coaxial with the first internal thread hole at the lower end is arranged on the upper end face of the fourth guide ejector rod 9. A counterbore 801 is arranged at the front part of the second internal thread hole on the third guide ejector rod 8, and a small clearance fit is provided between the inner diameter of the counterbore 801 and the outer diameter 1101 of the small end on the first booster side positioning block 11 to ensure accurate positioning of the first booster side positioning block 11. A third rectangular groove 802 is arranged through the center of the counterbore, and a small clearance fit is provided between the third rectangular groove 802 and the rectangular protrusion 1102 on the first booster side positioning block 11, so as to play a role in preventing misalignment in the waist-shaped direction of the assembly position of the third guide ejector rod 8 and the first booster side positioning block 11. A counterbore 901 is arranged at the front part of the second internal thread hole on the fourth guide ejector rod 9, and a small clearance fit is provided between the inner diameter of the counterbore 901 and the outer diameter 1201 of the small end on the second booster side positioning block 12 to ensure accurate positioning of the second booster side positioning block 11. A fourth rectangular groove 902 is arranged through the center of the counterbore, and a small clearance fit is provided between the fourth rectangular groove 902 and the rectangular protrusion part 1202 on the second booster side positioning block 12, so as to play a role in preventing misalignment in the waist-shaped direction of the assembly position of the fourth guide ejector rod 9 and the second booster side positioning block 12. Counterbores 601, a first rectangular groove 602, counterbores 701 and a second rectangular groove 702 with a small clearance fit with the first booster side positioning block 11 and the second booster side positioning block 12 are arranged on the first guide ejector rod 6 and the second guide ejector rod 7. In this way, when changing the models of the left and right rudders, as long as the first booster side positioning block 11 and the second booster side positioning block 12 are unscrewed from the third guide ejector rod 8 and the fourth guide ejector rod 9 by the second hexagon socket head cap screw 13, and then the first booster side positioning block 11 and the second booster side positioning block 12 are assembled into the corresponding counterbores 601, the first rectangular groove 602, counterbores 701 and the second rectangular groove 702 on the first guide ejector rod 6 and the second guide ejector rod 7, and the second hexagon socket head cap screw 13 is tightened, the replacement of the tooling for pressing the left and right rudder products can be completed.

[0084] As Figure 4 , Figures 9.1 to 9.3As shown, the first boost side positioning block 11 is used to position the first type of elastic bushing. The first boost side positioning block 11 is made of steel. During positioning, the first boost side positioning block 11 is inserted into the central hole of the kidney-shaped hole inner bushing 5901 of the first type of elastic bushing. The central hole of the kidney-shaped hole inner bushing 5901 is a kidney-shaped hole. The shape of the first boost side positioning block 11 matches the shape of the central hole of the kidney-shaped hole inner bushing 5901. There is a small clearance fit between the outer circular surface of the first boost side positioning block 11 and the kidney-shaped hole inner bushing 5901, ensuring accurate positioning of the elastic bushing and good anti-misassembly effect for the assembly position of the elastic bushing. In the middle of the upper end surface of the first boost side positioning block 11, a counterbore for assembling the second hexagon socket head cap screw 13 is provided. At the lower end of the first boost side positioning block 11, there is a small clearance fit with the counterbore 801 at the upper end of the third guiding ejector rod 8 and the third rectangular groove 802, which can position the center and the small end outer diameter 1101 and the rectangular protrusion 1102 for anti-misassembly of the assembly position.

[0085] As Figure 4 , Figures 9.1 to 9.3 shown, the second boost side positioning block 12 is used to position the first type of elastic bushing. The second boost side positioning block 12 is made of steel. During positioning, the second boost side positioning block 12 is inserted into the central hole of the kidney-shaped hole inner bushing 5901 of the first type of elastic bushing. The central hole of the kidney-shaped hole inner bushing 5901 is a kidney-shaped hole. The shape of the second boost side positioning block 12 matches the shape of the central hole of the kidney-shaped hole inner bushing 5901. There is a small clearance fit between the outer circular surface of the second boost side positioning block 12 and the kidney-shaped hole inner bushing 5901, ensuring accurate positioning of the elastic bushing and good anti-misassembly effect for the assembly position of the elastic bushing. In the middle of the upper end surface of the second boost side positioning block 12, a counterbore for assembling the second hexagon socket head cap screw 13 is provided. At the lower end of the second boost side positioning block 12, there is a small clearance fit with the counterbore 901 at the upper end of the fourth guiding ejector rod 9 and the fourth rectangular groove 902, which can position the center and the small end outer diameter 1201 and the rectangular protrusion 1202 for anti-misassembly of the assembly position.

[0086] As Figure 4 , Figures 8.1 to 8.3 , Figure 9.1 , Figure 14 and Figure 15As shown, at the position of the upper shaft diameter of the first guiding ejector rod 6, the second guiding ejector rod 7, the third guiding ejector rod 8 and the fourth guiding ejector rod 9, there are provided a first annular groove 603, a second annular groove 703, a third annular groove 803 and a fourth annular groove 903 for assembling an elastic retaining ring 10 for the shaft. An elastic retaining ring 10 for the shaft is arranged in the first annular groove 603 on the first guiding ejector rod 6. This elastic retaining ring 10 for the shaft is located above the oil-free bushing 54 arranged in the first guiding top sleeve 20. The outer diameter of the elastic retaining ring 10 for the shaft is larger than the inner hole diameter of the oil-free bushing 54. The elastic retaining ring 10 for the shaft can be used to achieve the function of axial limit when the first guiding top sleeve 20 moves upward. An elastic retaining ring 10 for the shaft is arranged in the second annular groove 703 on the second guiding ejector rod 7. This elastic retaining ring 10 for the shaft is located above the oil-free bushing 54 arranged in the second guiding top sleeve 26. The outer diameter of the elastic retaining ring 10 for the shaft is larger than the inner hole diameter of the oil-free bushing 54. The elastic retaining ring 10 for the shaft can be used to achieve the function of axial limit when the second guiding top sleeve 26 moves upward. An elastic retaining ring 10 for the shaft is arranged in the third annular groove 803 on the third guiding ejector rod 8. This elastic retaining ring 10 for the shaft is located above the oil-free bushing 54 arranged in the third guiding top sleeve 30. The outer diameter of the elastic retaining ring 10 for the shaft is larger than the inner hole diameter of the oil-free bushing 54. The elastic retaining ring 10 for the shaft can be used to achieve the function of axial limit when the third guiding top sleeve 30 moves upward. An elastic retaining ring 10 for the shaft is arranged in the fourth annular groove 903 on the fourth guiding ejector rod 9. This elastic retaining ring 10 for the shaft is located above the oil-free bushing 54 arranged in the fourth guiding top sleeve 15. The outer diameter of the elastic retaining ring 10 for the shaft is larger than the inner hole diameter of the oil-free bushing 54. The elastic retaining ring 10 for the shaft can be used to achieve the function of axial limit when the fourth guiding top sleeve 15 moves upward.

[0087] As Figure 6 , Figure 14 and Figure 15As shown in the figure, the upper pressing actuator includes a guiding pressing plate 41 and positioning rods which are arranged on the guiding pressing plate 41 and connected to the guiding bottom plate 14. The guiding bottom plate 14 is located below the guiding pressing plate 41. The guiding pressing plate 41 is horizontally arranged, located above the guiding bottom plate 14, and parallel to the guiding bottom plate 14. The outer dimension of the guiding pressing plate 41 is the same as that of the guiding bottom plate 14, in a rectangular shape, and made of aluminum plate material. The purpose is to reduce the weight of the tooling and facilitate the handling of the tooling. A total of four positioning rods are provided, namely the first positioning rod 38, the second positioning rod 40, the third positioning rod 36 and the fourth positioning rod 33. The first positioning rod 38, the second positioning rod 40, the third positioning rod 36 and the fourth positioning rod 33 are all the same shaft components with the same size and made of steel. The lower ends of the first positioning rod 38, the second positioning rod 40, the third positioning rod 36 and the fourth positioning rod 33 are fixedly connected to the guiding bottom plate 14 through the third hexagon socket head cap screws 21. Threaded holes for screwing with the third hexagon socket head cap screws 21 are arranged in the central axis direction of the lower end faces of the first positioning rod 38, the second positioning rod 40, the third positioning rod 36 and the fourth positioning rod 33. The upper ends of the first positioning rod 38, the second positioning rod 40, the third positioning rod 36 and the fourth positioning rod 33 are fixedly connected to the guiding pressing plate 41 through the third hexagon socket head cap screws 21. Threaded holes for screwing with the third hexagon socket head cap screws 21 are arranged in the central axis direction of the upper end faces of the first positioning rod 38, the second positioning rod 40, the third positioning rod 36 and the fourth positioning rod 33.

[0088] As Figure 6 , Figure 14 and Figure 15 shown in the figure, the press head assembly includes a press head body 46 and a back-pressure positioning plate 45 connected to the press head body 46. The back-pressure positioning plate 45 is located above the guiding pressing plate 41. The back-pressure positioning plate 45 is horizontally arranged and parallel to the guiding pressing plate 41. A through hole is arranged at the center of the guiding pressing plate 41. The diameter of the through hole is larger than the outer diameter of the press head body 46. There is a large clearance fit between the through hole and the large-end shaft diameter of the press head body 46, which can prevent interference between the guiding pressing plate 41 and the large-end head of the press head body 46 during the pressing process, and also facilitate the assembly and disassembly of the press head body 46 and the force sensor connector 55. At the four corners of the upper end face of the guiding pressing plate 41, there are counterbore holes on the same axis as the four corners of the guiding bottom plate 14 and counterbore holes for assembling the third hexagon socket head cap screws 21. It is connected together through the first positioning rod 38, the second positioning rod 40, the third positioning rod 36, the fourth positioning rod 33, the third hexagon socket head cap screws 21 and the counterbore holes on the guiding bottom plate 14 of the positioning device.

[0089] As Figure 6 , Figure 14 and Figure 15As shown, the backpressure positioning plate 45 is rectangular in shape and made of aluminum plate. Its purpose is to reduce the weight of the tooling and facilitate the handling of the tooling. A through hole for clearance fit with the upper small shaft diameter of the punch body 46 is provided in the middle of the backpressure positioning plate 45. The punch body 46 is a stepped shaft component made of steel. The upper end of the punch body 46 is fixedly connected to the force sensor connector 55 of the servo press 56. A rectangular ring groove is provided on the upper part of the small shaft diameter at the upper end of the punch body 46 and is fitted into the inner hole of the force sensor connector 55. The third hexagon socket head bolt 21 is locked in the rectangular ring groove on the small shaft diameter of the punch body 46 for positioning. When applying pressure, the force sensor connector 55 of the servo press 56 can push the punch body 46 and the backpressure positioning plate 45 downward. When returning to the original position, the force sensor connector 55 of the servo press 56 can pull the punch body 46 and the backpressure positioning plate 45 upward.

[0090] As Figure 6 , Figure 14 and Figure 15 shown, the backpressure device includes a backpressure rod connected to the backpressure positioning plate 45 and a backpressure adjusting rod connected to the backpressure rod and used to contact the elastic bushing. A total of four backpressure rods are provided, and the four backpressure rods are the first backpressure rod 44, the second backpressure rod 43, the third backpressure rod 47, and the fourth backpressure rod 48 respectively. The first backpressure rod 44, the second backpressure rod 43, the third backpressure rod 47, and the fourth backpressure rod 48 are vertically arranged. Threaded holes for screwing with the third hexagon socket head bolt 21 are provided in the central axis direction of the upper end surfaces of the first backpressure rod 44, the second backpressure rod 43, the third backpressure rod 47, and the fourth backpressure rod 48. The third hexagon socket head bolt 21 passes through the four through holes on the backpressure positioning plate 45 and is fixedly connected to the inner threaded holes at the upper ends of the four backpressure rods. The first backpressure rod 44 and the first guide top sleeve 20 are coaxially arranged, the second backpressure rod 43 and the second guide top sleeve 26 are coaxially arranged, the third backpressure rod 47 and the third guide top sleeve 30 are coaxially arranged, and the fourth backpressure rod 48 and the fourth guide top sleeve 15 are coaxially arranged. A total of four backpressure adjusting rods are also provided, and the four backpressure adjusting rods are the first backpressure adjusting rod 39, the second backpressure adjusting rod 53, the third backpressure adjusting rod 51, and the fourth backpressure adjusting rod 35 respectively. The first backpressure adjusting rod 39 is connected to the lower end of the first backpressure rod 44 and they are coaxially arranged. The second backpressure adjusting rod 53 is connected to the lower end of the second backpressure rod 43 and they are coaxially arranged. The third backpressure adjusting rod 51 is connected to the lower end of the third backpressure rod 47 and they are coaxially arranged. The fourth backpressure adjusting rod 35 is connected to the lower end of the fourth backpressure rod 48 and they are coaxially arranged. Four through holes are provided on the guide pressure plate 41, and two oil-free bushings 54 are press-fitted in each through hole. The first backpressure rod 44, the second backpressure rod 43, the third backpressure rod 47, and the fourth backpressure rod 48 respectively pass through the inner holes of the oil-free bushings 54 provided in the four through holes, and the inner holes of the respective oil-free bushings 54 are in clearance fit with the respective shaft diameters on the first backpressure rod 44, the second backpressure rod 43, the third backpressure rod 47, and the fourth backpressure rod 48.

[0091] such as Figure 6 , Figures 10.1 to 10.2 , Figure 14 and Figure 15As shown, the first return pressure rod 44, the second return pressure rod 43, the third return pressure rod 47, and the fourth return pressure rod 48 are all the same type of shaft components with the same dimensions, and the first return pressure rod 44, the second return pressure rod 43, the third return pressure rod 47, and the fourth return pressure rod 48 are all made of steel. Inner threaded holes that are screwed with the external threads on the first return pressure adjusting rod 39, the second return pressure adjusting rod 53, the third return pressure adjusting rod 51, and the fourth return pressure adjusting rod 35 are provided at the centers of the lower ends of the first return pressure rod 44, the second return pressure rod 43, the third return pressure rod 47, and the fourth return pressure rod 48. A fifth annular groove 4401, a sixth annular groove 4301, a seventh annular groove 4701, and an eighth annular groove 4801 for assembling a circlip for shaft 10 are provided at the positions of the shaft diameters of the inner threaded holes at the lower ends of the first return pressure rod 44, the second return pressure rod 43, the third return pressure rod 47, and the fourth return pressure rod 48. A circlip for shaft 10 is provided in the fifth annular groove 4401 on the first return pressure rod 44. This circlip for shaft 10 is located below the oil-free bushing 54 provided in the guide pressing plate 41, and the outer diameter of the circlip for shaft 10 is larger than the inner hole diameter of the oil-free bushing 54. A circlip for shaft 10 is provided in the sixth annular groove 4301 on the second return pressure rod 43. This circlip for shaft 10 is located below the oil-free bushing 54 provided in the guide pressing plate 41, and the outer diameter of the circlip for shaft 10 is larger than the inner hole diameter of the oil-free bushing 54. A circlip for shaft 10 is provided in the seventh annular groove 4701 on the third return pressure rod 47. This circlip for shaft 10 is located below the oil-free bushing 54 provided in the guide pressing plate 41, and the outer diameter of the circlip for shaft 10 is larger than the inner hole diameter of the oil-free bushing 54. A circlip for shaft 10 is provided in the eighth annular groove 4801 on the fourth return pressure rod 48. This circlip for shaft 10 is located below the oil-free bushing 54 provided in the guide pressing plate 41, and the outer diameter of the circlip for shaft 10 is larger than the inner hole diameter of the oil-free bushing 54. The circlips for shaft 10 provided in the fifth annular groove 4401, the sixth annular groove 4301, the seventh annular groove 4701, and the eighth annular groove 4801 on the first return pressure rod 44, the second return pressure rod 43, the third return pressure rod 47, and the fourth return pressure rod 48 can be used to limit the upper pressing actuator in the vertical direction. During the upward movement of the return pressure device, when the circlips for shaft 10 provided on the first return pressure rod 44, the second return pressure rod 43, the third return pressure rod 47, and the fourth return pressure rod 48 contact the oil-free bushing 54 provided in the upper guide pressing plate 41, the upper pressing actuator can be pulled to move upward synchronously.In the initial state, the indenter assembly remains stationary. The shaft retaining rings 10 installed in the fifth annular groove 4401, sixth annular groove 4301, seventh annular groove 4701, and eighth annular groove 4801 on the first return pressure rod 44, second return pressure rod 43, third return pressure rod 47, and fourth return pressure rod 48 are in contact with the oil-free bushing 54 installed in the upper guiding pressure plate 41, making the upper press-fitting actuator remain stationary. At the same time, the upper press-fitting actuator is connected to the positioning device, and the positioning device also remains stationary.

[0092] As Figure 6 , Figures 11.1 to 11.3 , Figure 14 and Figure 15 shown, the first return pressure adjusting rod 39, second return pressure adjusting rod 53, third return pressure adjusting rod 51, and fourth return pressure adjusting rod 35 are all shaft parts of the same size. The first return pressure adjusting rod 39, second return pressure adjusting rod 53, third return pressure adjusting rod 51, and fourth return pressure adjusting rod 35 are all made of steel. The centers of the upper ends of the first return pressure adjusting rod 39, second return pressure adjusting rod 53, third return pressure adjusting rod 51, and fourth return pressure adjusting rod 35 are provided with external threads that are screwed with the first return pressure rod 44, second return pressure rod 43, third return pressure rod 47, fourth return pressure rod 48, first adjusting nut 37, second adjusting nut 52, third adjusting nut 50, and fourth adjusting nut 34. One pair of side notches for tightening with an open-end wrench is provided on the shaft diameter at the external thread of the first return pressure adjusting rod 39, second return pressure adjusting rod 53, third return pressure adjusting rod 51, and fourth return pressure adjusting rod 35. The first adjusting nut 37, second adjusting nut 52, third adjusting nut 50, and fourth adjusting nut 34 are all external hexagon parts of the same size and are made of steel. An internal threaded hole for screwing with the external thread on the return pressure adjusting rod is provided in the middle. The first adjusting nut 37, second adjusting nut 52, third adjusting nut 50, and fourth adjusting nut 34 are respectively used to adjust and lock the end face distances between the first return pressure adjusting rod 39, second return pressure adjusting rod 53, third return pressure adjusting rod 51, fourth return pressure adjusting rod 35 and the bushings 5901 with waist-shaped holes and 6001 with circular holes in the press-fitting elastic bushings.

[0093] As Figure 6 , Figure 14 and Figure 15As shown, the first return pressure adjusting rod 39 is threadedly connected to the first return pressure rod 44. A first adjusting nut 37 is provided on the first return pressure adjusting rod 39. The first adjusting nut 37 is used to clamp and fix the first return pressure adjusting rod 39 to the first return pressure rod 44. The lower end face of the first return pressure adjusting rod 39 is used to contact the upper end face of the inner bushing 6001 of the circular hole of the second elastic bushing. Since it is a threaded connection, the distance between the lower end face of the first return pressure adjusting rod 39 and the return pressure positioning plate 45 can be adjusted. Furthermore, the distance that the second elastic bushing is pushed downward in the first accommodation hole 5804 during the return pressure stage can be adjusted, achieving the purpose of controlling the pressing-in amount of the second elastic bushing.

[0094] As Figure 6 , Figure 14 and Figure 15 As shown, the second return pressure adjusting rod 53 is threadedly connected to the second return pressure rod 43. A second adjusting nut 52 is provided on the second return pressure adjusting rod 53. The second adjusting nut 52 is used to clamp and fix the second return pressure adjusting rod 53 to the second return pressure rod 43. The lower end face of the second return pressure adjusting rod 53 is used to contact the upper end face of the inner bushing 6001 of the circular hole of the second elastic bushing. Since it is a threaded connection, the distance between the lower end face of the second return pressure adjusting rod 53 and the return pressure positioning plate 45 can be adjusted. Furthermore, the distance that the second elastic bushing is pushed downward in the second accommodation hole 5805 during the return pressure stage can be adjusted, achieving the purpose of controlling the pressing-in amount of the second elastic bushing.

[0095] As Figure 6 , Figure 14 and Figure 15 As shown, the third return pressure adjusting rod 51 is threadedly connected to the third return pressure rod 47. A third adjusting nut 50 is provided on the third return pressure adjusting rod 51. The third adjusting nut 50 is used to clamp and fix the third return pressure adjusting rod 51 to the third return pressure rod 47. The lower end face of the third return pressure adjusting rod 51 is used to contact the upper end face of the inner bushing 5901 of the kidney-shaped hole of the first elastic bushing. Since it is a threaded connection, the distance between the lower end face of the third return pressure adjusting rod 51 and the return pressure positioning plate 45 can be adjusted. Furthermore, the distance that the first elastic bushing is pushed downward in the third accommodation hole 5807 during the return pressure stage can be adjusted, achieving the purpose of controlling the pressing-in amount of the first elastic bushing.

[0096] As Figure 6 , Figure 14 and Figure 15As shown, the fourth return pressure adjusting rod 35 is threadedly connected to the fourth return pressure rod 48. A fourth adjusting nut 34 is provided on the fourth return pressure adjusting rod 35. The fourth adjusting nut 34 is used to tightly fix the fourth return pressure adjusting rod 35 to the fourth return pressure rod 48. The lower end face of the fourth return pressure adjusting rod 35 is used to contact the upper end face of the kidney-shaped hole inner bushing 5901 of the first elastic bushing. Due to the threaded connection, the distance between the lower end face of the fourth return pressure adjusting rod 35 and the return pressure positioning plate 45 can be adjusted. Furthermore, the distance that the first elastic bushing is pushed downward in the fourth accommodating hole 5806 during the return pressure stage can be adjusted, achieving the purpose of controlling the press-fitting amount of the first elastic bushing.

[0097] As Figure 6 , Figure 14 and Figure 15 shown, the press-fitting device further includes a limit plate. The placement position of the limit plate can be switched between a first position and a second position. The height of the first position is greater than the height of the second position. As Figure 14 and Figure 17 shown, during the preliminary press-fitting stage, the limit plate is in the first position. At this time, the limit plate is located on the top surface of the guiding pressure plate 41 and below the return pressure positioning plate 45. The downward pressure applied by the press head assembly can be transmitted to the guiding pressure plate 41 through the limit plate. As Figure 19 and Figure 20 shown, during the return pressure stage, the limit plate is in the second position. At this time, the limit plate is clamped between the press-fitting bottom plate 1 and the guiding bottom plate 14, providing a supporting effect on the positioning device through the limit plate.

[0098] As Figure 6 , Figures 14 to 20As shown in the figure, the limiting plate is a U-shaped component. There is a U-shaped groove on the limiting plate through which the return pressure rod and the guiding ejector rod pass. One end face of the limiting plate forms an opening through which the return pressure rod and the guiding ejector rod can pass, enabling the limiting plate in the first position to be removed from the guiding pressing plate 41, and similarly enabling the limiting plate in the second position to be removed from the pressing bottom plate 1. In this embodiment, two limiting plates are provided, namely the first limiting plate 42 and the second limiting plate 49. The first limiting plate 42 and the second limiting plate 49 are both the same U-shaped components with the same size. The first limiting plate 42 and the second limiting plate 49 are made of aluminum plate material, aiming to reduce the weight of the tooling and facilitate manual handling operation. The first limiting plate 42 and the second limiting plate 49 are used in cooperation. When the first limiting plate 42 and the second limiting plate 49 are in the first position, the first return pressure rod 44 and the second return pressure rod 43 pass through the U-shaped groove on the first limiting plate 42, and the third return pressure rod 47 and the fourth return pressure rod 48 pass through the U-shaped groove on the second limiting plate 49; when the first limiting plate 42 and the second limiting plate 49 are in the second position, the first guiding ejector rod 6 and the second guiding ejector rod 7 pass through the U-shaped groove on the first limiting plate 42, and the third guiding ejector rod 8 and the fourth guiding ejector rod 9 pass through the U-shaped groove on the second limiting plate 49. The notch part of the first limiting plate 42 and the second limiting plate 49 is provided with a guiding chamfer of 20 degrees to facilitate quick guiding and positioning when changing positions.

[0099] The present invention also provides a method for pressing an elastic bushing of an automotive electric power steering gear, adopting the automotive electric power steering gear elastic bushing pressing tooling with the above structure, and including the following steps:

[0100] S1. Apply a lubricating medium to the accommodation hole of the steering gear housing assembly and the elastic bushing.

[0101] S2. Install the elastic bushing on the lower pressing actuator.

[0102] S3. Install the steering gear housing assembly on the positioning device.

[0103] S4. The pressing head assembly descends, and the pressing head assembly applies a pressure in the first direction to the upper pressing actuator. The lower pressing actuator pushes the elastic bushing into the accommodation hole of the steering gear housing assembly.

[0104] S5. The pressing head assembly returns to its original position.

[0105] S6. The pressing head assembly descends again, and the return pressure device applies a pressure in the first direction to the elastic bushing located in the accommodation hole of the steering gear housing assembly to press the elastic bushing in place.

[0106] As Figure 2As shown, the steering gear housing assembly 61 is composed of a steering side housing 5803, an assist side housing 5802, and a steering gear connecting steel pipe 5801. The automotive electric power steering device includes a rack, and the rack is movably arranged in the inner cavity of the steering gear housing assembly 61. The steering gear housing assembly 61 has a structure with both ends open and hollow inside. The inner cavity of the steering gear housing assembly 61 is a circular cavity and extends from one end to the other end of the steering gear housing assembly 61 along the length direction of the steering gear housing assembly 61. The steering gear connecting steel pipe 5801 is a round pipe with both ends open and hollow inside. One end of the steering gear connecting steel pipe 5801 is inserted into the steering side housing, and the other end of the steering gear connecting steel pipe 5801 is inserted into the assist side housing 5802. The rack passes through the steering side housing, the assist side housing 5802, and the steering gear connecting steel pipe 5801. Four accommodating holes are provided in the steering gear housing assembly 61, namely a first accommodating hole 5804, a second accommodating hole 5805, a third accommodating hole 5807, and a fourth accommodating hole 5806. A second type of elastic bushing is installed in each of the first accommodating hole 5804 and the second accommodating hole 5805, and a first type of elastic bushing is installed in each of the third accommodating hole 5807 and the fourth accommodating hole 5806. The axes of the first accommodating hole 5804, the second accommodating hole 5805, the third accommodating hole 5807, and the fourth accommodating hole 5806 are parallel to each other. The first accommodating hole 5804 and the second accommodating hole 5805 are provided on the steering side housing 5803, and the third accommodating hole 5807 and the fourth accommodating hole 5806 are provided on the assist side housing 5802.

[0107] In the above step S1, as Figure 2 shown, a lubricating medium is applied to the surfaces of the end face elastic rubber 5902, the outer circle elastic rubber 5903, and the bevel groove 5904 on the first type of elastic bushing, and a lubricating medium is applied to the surfaces of the end face elastic rubber 6002, the outer circle elastic rubber 6003, and the bevel groove 6004 on the second type of elastic bushing. A lubricating medium is applied to the inner circular surface and the end faces at both ends of the hole of the first accommodating hole 5804, the second accommodating hole 5805, the third accommodating hole 5807, and the fourth accommodating hole 5806. The lubricating medium is lithium-based grease.

[0108] In the above step S2, as Figure 14As shown in the figure, two first elastic bushings coated with a lubricating medium are respectively placed into the inner holes of the third guiding top sleeve 30 and the fourth guiding top sleeve 15. The first assisting side positioning block 11 positions the first elastic bushing located in the third guiding top sleeve 30, and the second assisting side positioning block 12 positions the first elastic bushing located in the fourth guiding top sleeve 15. The first assisting side positioning block 11 and the second assisting side positioning block 12 are respectively inserted into the inner holes of the waist-shaped hole inner bushings 5901 of the two first elastic bushings. The lower end faces of the waist-shaped hole inner bushings 5901 of the two first elastic bushings are respectively in good contact and limited with the upper end faces of the third guiding top rod 8 and the fourth guiding top rod 9. Two second elastic bushings coated with a lubricating medium are respectively placed into the inner holes of the first guiding top sleeve 20 and the second guiding top sleeve 26. The lower end faces of the circular hole inner bushings 6001 of the two second elastic bushings are respectively in good contact and limited with the upper end faces of the first guiding top rod 6 and the second guiding top rod 7.

[0109] In the above step S3, as Figure 14As shown, take the steering gear housing assembly 61 and place the steering gear housing assembly 61 between the power-assisted side positioning plate 31 and the steering side positioning plate 22. The end face of the inner hole opening of the power-assisted side housing 5802 on the steering gear housing assembly 61 is in good contact and limited with the right end face of the power-assisted side positioning plate 31. And the lower end faces of the openings of the first accommodation hole 5804, the second accommodation hole 5805, the third accommodation hole 5807, and the fourth accommodation hole 5806 on the steering gear housing assembly 61 are respectively placed in good contact with the upper end faces of the openings of the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15. Push the power-assisted side positioning shaft 32 to move, so that the power-assisted side positioning shaft 32 is inserted into the first inner hole on the steering gear housing assembly 61 (the first inner hole is the central hole of the power-assisted side housing 5802). The end face of the small shaft diameter of the power-assisted side positioning shaft 32 is in good contact and positioned with the bottom surface of the central hole of the power-assisted side housing 5802. Push the steering side positioning shaft 23 to move, so that the steering side positioning shaft 23 is inserted into the second inner hole on the steering gear housing assembly 61 (the second inner hole is the central hole of the steering side housing 5803), and rotate the steering side positioning shaft 23 counterclockwise, so that the fourth internal hexagonal bolt 25 on the steering side positioning plate 22 slides into the second groove section 2302 of the steering side positioning shaft 23, and the end face of the small shaft diameter of the steering side positioning shaft 23 is in good contact with the bottom surface of the central hole of the steering side housing 5803. At this time, the positioning of the steering gear housing assembly 61 is completed through the end face limit of the power-assisted side positioning plate 31, the central positioning of the power-assisted side positioning shaft 32 and the steering side positioning shaft 23, the axial limit of the second groove section 2302 of the steering side positioning shaft 23 and the upper end faces of the openings of the first guiding top sleeve 20, the second guiding top sleeve 26, the third guiding top sleeve 30, and the fourth guiding top sleeve 15 are in good contact for the positioning of the position before press-fitting. Then rotate the first pressing plate 2901 and the second pressing plate 2902, so that the first cushion block 2801 and the second cushion block 2802 on the first pressing plate 2901 and the second pressing plate 2902 press on the steering gear connecting steel pipe 5801, and then use the first locking handle 17 and the second locking handle 19 to lock the first pressing plate 2901 and the second pressing plate 2902 on the first locking screw 16 and the second locking screw 18 respectively, to complete the positioning, pressing and fixing of the steering gear housing assembly 61. At this time, the first accommodation hole 5804 of the steering gear housing assembly 61 is located above the first guiding top sleeve 20 and the two are coaxial, the second accommodation hole 5805 of the steering gear housing assembly 61 is located above the second guiding top sleeve 26 and the two are coaxial, the third accommodation hole 5807 of the steering gear housing assembly 61 is located above the third guiding top sleeve 30 and the two are coaxial, and the fourth accommodation hole 5806 of the steering gear housing assembly 61 is located above the fourth guiding top sleeve 15 and the two are coaxial.

[0110] In the above step S4, as Figure 14As shown, entering the preliminary press-fitting stage, the start switch of the servo press 56 is toggled. The force sensor connector 55 on the servo press 56 pushes the press head body 46, the back-pressure positioning plate 45, and the back-pressure device to move downward synchronously. The upper press-fitting actuator, the positioning device, and the steering gear housing assembly 61 also move downward synchronously until the steering gear housing assembly 61 contacts the four elastic bushings below. The contact of the four elastic bushings can provide a certain supporting effect on the steering gear housing assembly 61, causing the upper press-fitting actuator, the positioning device, and the steering gear housing assembly 61 to stop descending; as Figure 16 shown, the first limit plate 42 and the second limit plate 49 are in the first position. As the press head assembly continues to move downward, when the back-pressure positioning plate 45 moves down to contact the top surfaces of the first limit plate 42 and the second limit plate 49, the press head assembly applies a pressure in the first direction to the positioning device. The first direction is the vertically downward direction. The press head assembly pushes the upper press-fitting actuator and the positioning device to continue moving downward. The positioning device drives the steering gear housing assembly 61 to move downward synchronously. During the downward movement of the steering gear housing assembly 61, the first guiding ejector rod 6 ejects the second type of elastic bushing located in the first guiding sleeve 20 into the first accommodation hole 5804, the second guiding ejector rod 7 ejects the second type of elastic bushing located in the second guiding sleeve 26 into the second accommodation hole 5805, the third guiding ejector rod 8 ejects the first type of elastic bushing located in the third guiding sleeve 30 into the third accommodation hole 5807, and the fourth guiding ejector rod 9 ejects the first type of elastic bushing located in the fourth guiding sleeve 15 into the fourth accommodation hole 5806 until the upper ends of the end face elastic rubber 5902 of the two first type of elastic bushings respectively extend above the third accommodation hole 5807 and the fourth accommodation hole 5806, and the upper ends of the end face elastic rubber 6002 of the two second type of elastic bushings respectively extend above the first accommodation hole 5804 and the second accommodation hole 5805; as Figure 17 shown, continue to move downward for press-fitting until the end face elastic rubber 5902 of the two first type of elastic bushings and the end face elastic rubber 6002 of the two second type of elastic bushings are completely exposed above the four accommodation holes.

[0111] In the above step S5, as Figure 18 shown, after the end face elastic rubber 5902 of the two first type of elastic bushings and the end face elastic rubber 6002 of the two second type of elastic bushings are completely exposed, the servo press 56 automatically returns to the zero position. The servo press 56 drives the press head assembly to move upward, causing the press head assembly to return to the initial position. At this time, the process of press-fitting the four elastic bushings simultaneously has been completed.

[0112] In the above step S6, as Figure 19As shown, when entering the backpressure stage, the first limit plate 42 and the second limit plate 49 need to move to the second position. After removing the first limit plate 42 and the second limit plate 49 placed on the guiding pressing plate 41 and positioning them between the first guiding ejector rod 6, the second guiding ejector rod 7, the third guiding ejector rod 8, and the fourth guiding ejector rod 9 placed on the pressing bottom plate 1, the start switch of the servo press 56 is toggled again. The force sensor connector 55 on the servo press 56 pushes the press head body 46, the backpressure positioning plate 45, and the backpressure device to move downward synchronously. The upper pressing execution mechanism, the positioning device, and the steering gear housing assembly 61 with an elastic bushing also move downward synchronously. When the bottom surface of the guiding bottom plate 14 contacts the top surfaces of the lower first limit plate 42 and the second limit plate 49, there is a certain gap between the lower end face of the kidney-shaped hole bushing 5901 of the first elastic bushing located in the third accommodation hole 5807 and the upper end face of the third guiding ejector rod 8 (that is, the lower end face of the kidney-shaped hole bushing 5901 does not contact the upper end face of the third guiding ejector rod 8), and there is a certain gap between the lower end face of the kidney-shaped hole bushing 5901 of the first elastic bushing located in the fourth accommodation hole 5806 and the upper end face of the fourth guiding ejector rod 9 (that is, the lower end face of the kidney-shaped hole bushing 5901 does not contact the upper end face of the fourth guiding ejector rod 9), and there is a certain gap between the lower end face of the circular hole bushing 6001 of the second elastic bushing located in the first accommodation hole 5804 and the upper end face of the first guiding ejector rod 6 (that is, the lower end face of the circular hole bushing 6001 does not contact the upper end face of the first guiding ejector rod 6), and there is a certain gap between the lower end face of the circular hole bushing 6001 of the second elastic bushing located in the second accommodation hole 5805 and the upper end face of the second guiding ejector rod 7 (that is, the lower end face of the circular hole bushing 6001 does not contact the upper end face of the second guiding ejector rod 7); as the press head assembly continues to move downward, the backpressure device also moves downward synchronously; during the downward movement of the backpressure device, when the first backpressure adjusting rod 39 contacts the upper end face of the circular hole bushing 6001 of the lower second elastic bushing, the first backpressure adjusting rod 39 pushes the circular hole bushing 6001 of the second elastic bushing to move downward towards the first accommodation hole 5804 until the second elastic bushing moves a set distance and the pressing is in place; during the downward movement of the backpressure device, when the second backpressure adjusting rod 53 contacts the upper end face of the circular hole bushing 6001 of the lower second elastic bushing, the second backpressure adjusting rod 53 pushes the circular hole bushing 6001 of the second elastic bushing to move downward towards the second accommodation hole 5805 until the second elastic bushing moves a set distance and the pressing is in place;During the downward movement of the backpressure device, when the third backpressure adjusting rod 51 contacts the upper end face of the kidney-shaped hole inner bushing 5901 of the first elastic bushing below, the third backpressure adjusting rod 51 pushes the kidney-shaped hole inner bushing 5901 of the first elastic bushing to move downward into the third accommodation hole 5807 until the first elastic bushing moves a set distance and is pressed in place; during the downward movement of the backpressure device, when the fourth backpressure adjusting rod 35 contacts the upper end face of the kidney-shaped hole inner bushing 5901 of the first elastic bushing below, the fourth backpressure adjusting rod 35 pushes the kidney-shaped hole inner bushing 5901 of the first elastic bushing to move downward into the fourth accommodation hole 5806 until the first elastic bushing moves a set distance and is pressed in place. After the four elastic bushings are pressed in place synchronously, the inner bushings on the four elastic bushings move downward until the distances between their upper and lower end faces and the two side end faces of the housing hole are the same (e.g., Figure 20 as shown), the servo press 56 automatically returns to the zero position, and at this time, the process of simultaneously applying backpressure to the four elastic bushings has been completed.

[0113] The method for pressing the elastic bushing of the automotive electric power steering gear of the present invention further includes the following steps:

[0114] S7. After the operator simultaneously removes the first limit plate 42 and the second limit plate 49 placed on the pressing base plate 1 with both hands, and locates them between the first backpressure rod 44, the second backpressure rod 43, the third backpressure rod 47, and the fourth backpressure rod 48 placed on the guiding pressure plate 41, then simultaneously unscrew the first locking handle 17 and the second locking handle 19 with both hands, open the first pressing plate 2901 and the second pressing plate 2902 pressing on the steering gear connecting steel pipe 5801, and simultaneously release the power-assisted side positioning shaft 32 and the steering side positioning shaft 23 with both hands, and remove the steering gear housing assembly 61 of the pressed elastic bushing. At this time, the entire process of pressing the elastic bushing of the steering gear has been completed.

[0115] The pressing tool and method for pressing the elastic bushing of the automotive electric power steering gear of the present invention solve the deficiencies existing in the existing pressing methods of the tooling. The advantages are as follows:

[0116] 1. The tooling structure is simpler, and the investment cost of equipment and tooling is less.

[0117] 2. A common servo press 56 can be used, without the need for a complex structural design of servo electric cylinder presses at both ends, improving the versatility of the equipment and tooling and the efficiency of product type change.

[0118] 3. The operation is simple, convenient, and reliable; only by changing the position of the limit plate on the tooling, the two processes of pressing and backpressing the elastic bushing can be completed.

[0119] 4. The guiding ejector rod at the lower end and the back pressure adjusting rod at the upper end can simultaneously perform the pressing and back pressure processes of the four elastic bushings, improving the pressing accuracy and working efficiency.

[0120] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, directly applying the above-mentioned concept and technical solution of the present invention to other occasions, they are all within the protection scope of the present invention.

Claims

1. Electric power steering elastic bushing pressing tool for automobiles, characterized in that It includes a positioning device for positioning the steering gear housing assembly, a pressing device for applying pressure in a first direction to the positioning device and pressing an elastic bushing into the accommodation hole of the steering gear housing assembly, and a backpressure device for applying pressure in the first direction to the elastic bushing located in the accommodation hole of the steering gear housing assembly. The backpressure device is arranged on the pressing device; The positioning device includes a guiding bottom plate, a locking mechanism for applying pressure to the steering gear housing assembly, a guiding top sleeve aligned with the position of the accommodation hole on the steering gear housing assembly, and a first inner hole positioning mechanism and a second inner hole positioning mechanism for positioning the steering gear housing assembly at both ends of the steering gear housing assembly respectively. The locking mechanism, the guiding top sleeve, the first inner hole positioning mechanism and the second inner hole positioning mechanism are arranged on the guiding bottom plate. Four accommodation holes are arranged on the steering gear housing assembly, and a total of four guiding top sleeves are provided. The four guiding top sleeves are the first guiding top sleeve, the second guiding top sleeve, the third guiding top sleeve and the fourth guiding top sleeve respectively; The pressing device includes a lower pressing execution mechanism that cooperates with the positioning device and is used to press the elastic bushing into the accommodation hole of the steering gear housing assembly, an upper pressing execution mechanism connected to the positioning device, and a pressing head assembly for applying pressure in the first direction to the upper pressing execution mechanism. The backpressure device is connected to the pressing head assembly and the upper pressing execution mechanism; The lower pressing execution mechanism includes a pressing bottom plate and guiding ejector rods arranged on the pressing bottom plate and inserted into the guiding top sleeves. A total of four guiding ejector rods are provided. The four guiding ejector rods are the first guiding ejector rod, the second guiding ejector rod, the third guiding ejector rod and the fourth guiding ejector rod respectively. The first guiding ejector rod is inserted into the first guiding top sleeve, the second guiding ejector rod is inserted into the second guiding top sleeve, the third guiding ejector rod is inserted into the third guiding top sleeve, and the fourth guiding ejector rod is inserted into the fourth guiding top sleeve. A first assisting side positioning block is arranged on the third guiding ejector rod, and a second assisting side positioning block is arranged on the fourth guiding ejector rod; The upper pressing execution mechanism includes a guiding pressing plate and positioning rods arranged on the guiding pressing plate and connected to the guiding bottom plate. The guiding bottom plate is located below the guiding pressing plate. The pressing head assembly includes a pressing head body and a backpressure positioning plate connected to the pressing head body. The backpressure positioning plate is located above the guiding pressing plate; The pressing device further includes a limiting plate which is arranged to be switchable between a first position and a second position; In the preliminary pressing stage, the limiting plate is in the first position. At this time, the limiting plate is located on the top surface of the guiding pressing plate and below the backpressure positioning plate; in the backpressure stage, the limiting plate is in the second position. At this time, the limiting plate is clamped between the pressing bottom plate and the guiding bottom plate; The backpressure device includes a backpressure rod connected to the backpressure positioning plate and a backpressure adjusting rod connected to the backpressure rod and used to contact the elastic bushing.

2. The elastic bushing press-fitting tooling for an automotive electric power steering gear according to claim 1, wherein The first inner hole positioning mechanism includes a boosting side positioning plate disposed on the guiding bottom plate and a boosting side positioning shaft disposed on the boosting side positioning plate and adapted to be inserted into a first inner hole of the steering gear housing assembly. The second inner hole positioning mechanism includes a steering side positioning plate disposed on the guiding bottom plate and a steering side positioning shaft disposed on the steering side positioning plate and adapted to be inserted into a second inner hole of the steering gear housing assembly. The boosting side positioning shaft and the steering side positioning shaft are parallel to a second direction, and the second direction is perpendicular to the first direction.

3. The elastic bushing press-fitting tooling for the automotive electric power steering gear according to claim 1, characterized in that, The locking mechanism includes a positioning block and a locking screw disposed on the guiding bottom plate, a pressing plate rotatably connected to the positioning block, and a locking handle for fixing the pressing plate on the locking screw. A cushion block for contacting the surface of the steering gear housing assembly is disposed on the pressing plate.

4. Method for press-fitting elastic bushing of automotive electric power steering gear, characterized in that, Adopt the elastic bushing pressing tooling for automotive electric power steering gears according to any one of claims 1 to 3, and it includes the steps of: S1. Apply a lubricating medium to the accommodating hole of the steering gear housing assembly and the elastic bushing. S2. Install the elastic bushing on the lower pressing actuator. S3. Install the steering gear housing assembly on the positioning device. S4. The pressing head assembly descends. The pressing head assembly applies a pressure along the first direction to the upper pressing actuator, and the lower pressing actuator pushes the elastic bushing into the accommodating hole of the steering gear housing assembly. S5. The pressing head assembly returns to its original position. S6. The pressing head assembly descends again. The backpressure device applies a pressure along the first direction to the elastic bushing located in the accommodating hole of the steering gear housing assembly to press the elastic bushing in place.

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